One-dimensional coupled model for large-deformation electroosmotic consolidation and heavy metal ion migration of silt

ZHOU Ya-dong; ZHAI Xin-dong; YANG Wen-qing

doi:10.11779/CJGE202210008

Volume 44 Issue 10

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Chinese Journal of Geotechnical Engineering > 2022 > 44(10): 1827-1836. > DOI: 10.11779/CJGE202210008

ZHOU Ya-dong, ZHAI Xin-dong, YANG Wen-qing. One-dimensional coupled model for large-deformation electroosmotic consolidation and heavy metal ion migration of silt[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(10): 1827-1836. DOI: 10.11779/CJGE202210008

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One-dimensional coupled model for large-deformation electroosmotic consolidation and heavy metal ion migration of silt

1.
Key Laboratory of Soft Soils and Engineering Environment of Tianjin Province, Tianjin Chengjian University, Tianjin 300384, China
2.
College of Civil Engineering, Tongji University, Shanghai 200092, China

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Received Date: October 07, 2021
Available Online: December 11, 2022

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Abstract

Abstract

Dewatering and metal removal of silt can be obtained by applying electrokinetics. A coupled model for one-dimensional electroosmosis consolidation and ion migration, called ECT1, is proposed. It employs the piecewise linear finite difference method to simulate the ion migration and large-strain consolidation of soils under the coupling action of electric field, seepage field and chemical field, and to account for the nonlinear variation of physical and electro-chemical properties of soils, such as adsorption/desorption, neutralization/ionization, and precipitation/dissolution. The model is verified by Alshawabkeh's electrokinetic remediation experimental results for contaminated soil, numerical solutions and treatment tests on high-moisture content heavy metal-contaminated soil electrokinetic. The proposed model is applied to example studies to elucidate the coupling mechanism of heavy metal migration and consolidation in the electrokinetic treatment of high-moisture content contaminated silt.
- electroosmotic consolidation,
- ion migration,
- heavy metal,
- silt,
- electrokinetic treatment

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